The Star Trek Experience, hosted by the Las Vegas Hilton, takes guests on a simulated journey throught the Star Trek universe. It's part theme park, part flight simulator, part integalactic restaurant, and part "museum of the future" with displays of memorabilia from multiple TV series and movies.
Trekkie couples may be interested in being married by a Star Fleet Officer on the bridge of the enterprise, and having Klingons and Ferengis at witnesses!